Abstract
Plant roots have evolved adaptive strategies mediated by transcriptional networks to cope with fluctuating nitrogen (N) forms and availability. However, the mechanisms linking root-foraging responses to N use efficiency (NUE) in crops remain poorly understood. Here, we show that rice exhibits enhanced root elongation under nitrate compared with ammonium, particularly under low N supply, suggesting a specific regulatory role for nitrate in root morphogenesis. We identify the transcription factor OsMADS61 as a key regulator of nitrate-dependent root morphological and physiological responses, as well as NUE, especially under N-limited conditions. OsMADS61 acts as a transcriptional activator of nitrate metabolism by directly binding to OsNRT2.1 and OsNR2 promoters. Nitric oxide produced via the nitrate reductase pathway, under the control of nitrate-responsive OsMADS61, precisely triggers cell proliferation in the root meristem. Moreover, single-nucleotide polymorphisms in the OsMADS61 promoter may be associated with differential root-foraging responses to nitrate availability. Therefore, enhancing N-adaptive root responses to optimize N uptake and assimilation represents a promising strategy for breeding crops with high NUE.
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Claims 6
Claim · model-written summary
Rice roots elongated more under nitrate than ammonium, especially with low nitrogen.
- Taxon
- rice
Oryza sativae0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice exhibits enhanced root elongation under nitrate compared with ammonium, particularly under low N supply”
e1“rice exhibits enhanced root elongation”
Claim · model-written summary
OsMADS61 regulates nitrate-dependent root morphology and physiology and NUE under nitrogen limitation.
- Taxon
- riceOryza sativae0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“OsMADS61 as a key regulator of nitrate-dependent root morphological and physiological responses, as well as NUE, especially under N-limited conditions”
e1“rice exhibits enhanced root elongation”
Claim · model-written summary
OsMADS61 activates nitrate metabolism by directly binding OsNRT2.1 and OsNR2 promoters.
- Taxon
- riceOryza sativae0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“OsMADS61 acts as a transcriptional activator of nitrate metabolism by directly binding to OsNRT2.1 and OsNR2 promoters”
e1“rice exhibits enhanced root elongation”
Claim · model-written summary
Nitrate-reductase-derived nitric oxide triggers cell proliferation in the root meristem under OsMADS61 control.
- Taxon
- riceOryza sativae0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitric oxide produced via the nitrate reductase pathway, under the control of nitrate-responsive OsMADS61, precisely triggers cell proliferation in the root meristem”
e1“rice exhibits enhanced root elongation”
Claim · model-written summary
OsMADS61 promoter polymorphisms may be associated with differing root responses to nitrate.
- Taxon
- riceOryza sativae0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“single-nucleotide polymorphisms in the OsMADS61 promoter may be associated with differential root-foraging responses to nitrate availability”
e1“rice exhibits enhanced root elongation”
Claim · model-written summary
The authors propose enhancing nitrogen-adaptive roots as a breeding strategy for high NUE.
Verbatim
e0“enhancing N-adaptive root responses to optimize N uptake and assimilation represents a promising strategy for breeding crops with high NUE”
e1“rice exhibits enhanced root elongation”
The same questions in other papers
nitrogen · growth · Oryza sativa (rice)Positive and negative results
401 papers in the same direction as this paper · 101 in the opposite direction · 8 reporting no difference from an alternative
- negative
- negative
- negative
507 papers more in this group
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